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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d3874555ebddfa95e542b84de9ba5b1f04aaa19c5d0f838ee32b4c26acabe05' 
  AND token = 'Sc25TZOlrW0jkysXBgmdNqL5K2HVtH2Ocrwe0ZjGb5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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