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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6fbc0b52b050b9706b6265da8898bbfca4985b398d7106442f05b89d031a1a0' 
  AND token = '8Tkg8ZQBiAWTKXR+gT9V1P19+vuD6sTHT0579VybBHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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