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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e9d0a6de36e598bee2c67c695d5fb31c3d077f5691b3d2c75fcdc55f81da18b' 
  AND token = 'eVg3WZ3jQZgPS9BaEcl3ayVlb2DnaMS8dS4O1aA1/Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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