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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91e53c5d6564fd239f3cd3a3bc442d58e16c2ab8ce288befd17f64c799eb9558' 
  AND token = 'bvfVJi53auICrdDYx2EpbiaqiLgIRdi7LfVIgqVJIN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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