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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '806c2eaf3d00524c392afa7ad5370321a90442d56a3a6df9ea8883854e31eca2' 
  AND token = 'vrTkeUAFIIqu6uWG8fjPLdObPJ2CEv43S2qyuHxv63I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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