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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2a372f97dabd61e4b5b0d27d3e8e3615a730a77f00206dea8d6b5164b4366bb' 
  AND token = 'nUVnnAFeb62Ug2Z7CkruLCWJvDtp3apzSMRtJ/oRDIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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