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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f1473eb05be0e6af03f50c9db08502cfdcfc3e963f8a2062b1eec823b441ed2' 
  AND token = 'xa2IIFQ5N9iU3wRIa1V1LQLEzvd5tReg99X+QHKbH+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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