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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6d0b231133145ab611086f3eda05aa3b57ab9dcda488c59b7279f88cdac082d' 
  AND token = 'vEIGXBpg7qF9MCcy8pX0EkqIu0rkzHTPF9odmmWjFsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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