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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83505500c47dfd89fa5528240d090d4aab6b30ba055e63a6324aa16c2be7cfa1' 
  AND token = 'wtjfAV3++PvbHEFEWtP450sh8RS9JgDYIijM24TV3gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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