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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dac62d36a7bbeb5755ab716fab472b2f3191b969d81e313cd79efcee42bc9b4d' 
  AND token = 'iUejvo5S+hzEk7dNEhQIVnKOmVOu41P9Ki8wR2q5svk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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