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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0213f7ac465712b0db9f799b93e023fab5c2d8b07ef6b58a54b89a1895160d7' 
  AND token = 'cO78DPceWCSE3uwiZldPhARMqmy5LKE/uc+WD6D5R20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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