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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c44b8b74bd6b8d4a637e8eec01ce17fc37f7033376064154b5085cd83916e57f' 
  AND token = 'nqdF9HlG4POtQv22Q5HHC/EyDmJP2Rz+QDcn2iRoX1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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