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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe3d7092fc419c653754c7e815e94ad5a7aabaaf03232ca96457996c42218d28' 
  AND token = '8RQAGmdZrpIcMuXUf/H2mdnF0CAgQVa5dhkcgNhJo94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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