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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b95edab58800ad710f2a1fe43ffd75ece01351b7c60a46f5d744534634ab699c' 
  AND token = 't5a/LAmeBHPgbuernw4Lnj9gl2FHpEH9F4ZxFjTgvWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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