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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3d1c4881f188ddea186cb086dcb545eeb60e57279f4bf8f3a470b410b520610' 
  AND token = '+cceYy+LbrMCmOuGXVScG/WhRMMMpwdnhv7xyeeQI/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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