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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cee26d19cf554329409a840ca19c78d50c74774541fa17de9dcfde040b08b2f' 
  AND token = 'D270O0TqFwc83L4/rgfs/ekHAy8E+DxfQ/pTW9/e3Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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