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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0b626ffd982d77d3a0237f88c0cffd1e9db4d8a618121bb2e4719b97c18374c' 
  AND token = 'nyPGpp8QgG7IhcRvRCW8VP3awhjjymiX6fIxEt1J9PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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