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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf3a7781800c50af1f2dcee94da4fee87e2557d7f376e888a9bd717643613b53' 
  AND token = 'aHQAJAOseiShRi1WRb3tX2q3HcI13Hpa7wViiEukM40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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