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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba4fee0d0c2ea6300b0de4f5a58ca1b40db55c53adcba1758be67d58f4a5c98d' 
  AND token = 'OE2qzp9Y5p20J8ugDgQc54VBn4R/l726TKoHMfvmsDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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