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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85b036253e77fa1058364541c4b24f7fa1fb91145bb5ae9e00453394571e3408' 
  AND token = 'ImqXfEfhZHl2GdFLHqbqwusGvz0YnLu93kS7kSU3eto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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