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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6b065557b0e19d378be2b313250f375ef644723512f9f3c8dd017716c74e7b3' 
  AND token = 'BiMl9k1gMbMIvi+uGeYKASg7cJYbbhDx1aCDBV3IgR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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