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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fddf71a6f0b74c65cd01930a540c630f1b07d07ab2e291ebeb0e6cc14e8ef3df' 
  AND token = 'V8QGSliDOAoTyqAlqycSY5qtL/bnto1B2Sqi6m/4oNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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