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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aab31f8508072e0f4c3369480281e8275d2fa306357d82f5d465095284ac3f46' 
  AND token = 'f9C3y8ZphEog+NgZaz4eTBxcRKBSOurdFrdmWK5ShLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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