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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b88656f65d4570ceb574e63a52129814e665934964db45139fe4033bba532c09' 
  AND token = 'sRz+oWfALgIes1pRdtIf11Alznm/ztJA+P3hgRBDrLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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