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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed560d646d06aa42d4aaa863431558acfb348d811ade9ad13b5f12429bf4e816' 
  AND token = 'izLVpFd8mG+8xxu0Eab1uoF6r+hoyNBddSPFP9uAD+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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