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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3c2f4f7132d5bd3bb02a0bda5420f85735d231ac633754cadb136587308ae9e' 
  AND token = 'Gr7WObzsWomyNnQ0c4TGQnEA/7KS7t7p2CsD86ttMKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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