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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70c683c9f2483e2532203e2f66c5d4460c3878a6b4f8f430af9576e8a7ab92eb' 
  AND token = 'rhX3ipiYMcJqVMfmNagJrf9RVviogN2WZyBjbh0pgJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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