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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3501c7afd8665002e53df5e6e2bb067a5c76dfe14805ca531e536c99767a6908' 
  AND token = 'f6vRid2YOiSnDT1/ycVUaMmHqWGoY0cNozpQiABNfwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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