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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '688a88e29ef7635ac0e866f1e8364ed4170d9bab6127870e70805a5056c9a9c3' 
  AND token = 'P3xvHSdbc7dn44OmeO4MXuqUJkcNm2aOHiNWgXDtopM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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