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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe0082be7215b6cc88a5f1f2d7958cbf45a8956e4bda3f12f53f83a01f8b51fc' 
  AND token = 'kqFiW31CL0Rj4kNZkLzSNcQE8O9vFEl0Z0r+BNAYEAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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