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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30d98bac2a447a7f9531b60b0aeba1679e574cad0047b852aebb5f2aed4ab7a0' 
  AND token = 'LK2XSuG/fm8t6TCKcHkOqVp2efrvwYOMp4raUFIbPE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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