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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fa8f35bf53fa6d82a502262e22f992a12ad33ac50b67b4cfd8d4be91cb4c3ba' 
  AND token = '6AK8lq0/W460SGrELNmWU70jn6GqtB0RTzqhmf5dDTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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