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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '975da52ea9691020ee4538f85ac2f24e745e1158413de4529696e04c31c27bc0' 
  AND token = 'Bfkv/SlM29tbDwtHBEoA52gG3QQQ/oOvmLGXodeFJNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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