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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34bfb2a42493441ee36fef377287bacb2dd28a3023e18c3f3cb2b8d75a3893d5' 
  AND token = 'I9RKFptxPTpMW+nJgnjQIelPdCDSYq2z+u8heDSt+W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}