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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ba80b1ed146b07b22fe3f6aa9a02b2fce2b7bb1ff12e0027fd6117dcb9e3281' 
  AND token = 'wypLDBlptJ/UzYkE2oppwCwbCkeIRKt437CEp0/nAwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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