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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '625aff0765bf8f2a50d79e02525c0783c5774ce3c92298cbd2c1ac6b2ef5e783' 
  AND token = 'icCFtH2/vy6imQik8ChLucyNVp8jUSvM95Z2rxl2a/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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