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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7dbf5ce09cbefc21dd701f06e4b4db6e15876b97564e36ab936c3b56ebf0733' 
  AND token = 'y27Q0i9yMqsjzhTdqfrQ4x2KnryFig0H4kzJ2zcS4Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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