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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0193e1766aca8da961531e550440d7c13f16d911188ec2d38005414a2bdee7a0' 
  AND token = '/H5kDTmHgGFlC739lDthatwP0eFTV/hxst4l54v7zyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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