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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89cb2cfb1fc15bd0ad35d065b46a36e921897ff20ba5c5e9fa29edb2b35499fe' 
  AND token = 'fwpiI9oGJfyBr07b+2mu7e1QxsI2U5WfaFwkeFLL7nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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