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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fe271721895a99719b87d1a0d3f963d8a34ec196dafae2614d14e3778014177' 
  AND token = 'N+2TQxBfVrSdotbtJFlS6K5JNePBk6h4mEuHCj++TV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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