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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84bd14be8182a2d5579de1836c56ae7a17d93ae179e44c2f4a7353f6e0bb0640' 
  AND token = '5MalCxaY1JdBnD1g0ILP3vBAvyzHbqS2tMo8c21BB+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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