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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0f557d5451af0f6dc09c3a6ec8c7a2cd0051588f2d08085dc8e06884cdf5fba' 
  AND token = '8c863FP1mKxF+1kN+v+CFfPytkkSoI/0rdqxs+1ZO+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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