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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1667b5d86bbfa8803c5fffcca5fcf4305e1c4e2e7f1916fb7459884b68733ab9' 
  AND token = 'Ss4lwmtQ1XGZyNaYUxlpBbyeoFdVrRz0CntgVCqaaF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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