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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f13f957105b02b8c724df736d8f7070b369c68afb628830bce6b8a576ebec4a' 
  AND token = 'LFqAfb+UStVqTzwD3EFml2Y1kd5ROcmBcyuGd5Fu4x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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