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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18e545a481b23e6ad1f621b6c44a9f799e7a09c6faf146612559739117597139' 
  AND token = 'zc7eD3YsxX7eDtejWjI/tXEYe3dO8Iib00EpJDcCoWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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