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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1c0032928ee2b2debe245e6e8ea473e58b5d38d4ac0b0491578bec022aa2ec9' 
  AND token = 'F79Gm12SS4t2ESYmh9PpM/Gi843Cz5es7/H/tYSwSOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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