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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1792f5df84247b79c005b1c23f9271037e4833e0244b5cda0f39b266e4aea224' 
  AND token = 'HdewTrc0+Jvteyf68Nf7+J7mom77lSo7yWLhBF+CKJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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