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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7767bc5f0f8cff82a3053a7146eb177374971f80de5f4910d3e3d7e3831e868a' 
  AND token = 'Z1lh04gCTRwHTI7tXa3H7OkIuYb3JFMcSRtBOzp3EYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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