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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '134123ae7d9896a09fddda040f406d25eb41be885a6c8c8594b6534ad4462034' 
  AND token = 'O4G7+bPkt3WVEa4ub7sfgY0lvgOAlK+7o8N3d+icP+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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