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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38e7999e182248eab70cf1a7421bbb1166e7291965fedd169b2bbc708503657d' 
  AND token = 'RtXIDWERg2DEr0/uB5UWSzz3Dm18qs1v3gB+kA6eOdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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