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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72bd65c36b7c47a18e7f737e4a8e5017fd01084427beb977cd3ee8b26ec7b90d' 
  AND token = 'g9p/Rh9fB5diOOaGX2kJ/rlz8MAFmCaanK3G4JYyDKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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