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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53eb59b84c73676ac8577ea92fc7c2583677a74ebb97868cfad93bc5e0d653f5' 
  AND token = 'vGD0XsRdCdLBF9BUeSzSxYMXp9r4nCaaW1UmU2vZaB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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