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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e82d4e150d40fa2238c5a4da47eb83c062023cceb18031a9cb7428f6a84c7fe2' 
  AND token = 'FMogkXx1DeN2e8fcMRmOJrILJoP5VAEAq75s13aHLtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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