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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63cecd482005b57c6d1afeaf3de7f29d0eaf55bd3e3b1a29ea416f3da06e3c2b' 
  AND token = 'MUL3F+8DqiWCbTS9cGp3T4Io296nO//7k8ercFJ+KsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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