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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5b3fecdee06923c5fe2d82102fde9cf4e3b27c24691cb0c6aa4d4f7a0223965' 
  AND token = 'w+ufluBcrjETsqUurJmxvOnNIg8CNg093IoAeeGHAJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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